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<title>Problem 2103. -- Fire 消防站 -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2103: Fire 消防站</h2><span class=green>Time Limit: </span>30 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>259 MB<br><span class=green>Submit: </span>37&nbsp;&nbsp;<span class=green>Solved: </span>21<br>[<a href='submitpage.php?id=2103'>Submit</a>][<a href='problemstatus.php?id=2103'>Status</a>][<a href='bbs.php?id=2103'>Discuss</a>]</center><h2>Description</h2><div class=content> <img border="0" src="images/2103.jpg"> 
</div><h2>Input</h2><div class=content>共N+1行。
第一行有一个正整数N，表示区域的个数。
接下来有N-1行，每行两个整数u、v，表述区域u和区域v之间有一条道路。
最后一行有N个正整数，第i个正整数表示区域i的权值W(i)。
</div><h2>Output</h2><div class=content>包含一个正整数，为最小的S(x, y)的值。
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>5<br />
1 2<br />
1 3<br />
3 4<br />
3 5<br />
5 7 6 5 4	</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>14<br />
【样例解释】<br />
选取区域2和区域3。<br />
【数据规模和约定】<br />
用H表示距离区域1最远结点的距离，即d(1, u)的最大值。<br />
对于30%的数据满足：2 ≤ N ≤ 5000、H ≤ 30<br />
对于70%的数据满足：2 ≤ N ≤ 50000、H ≤ 30<br />
对于100%的数据满足：2 ≤ N ≤ 50000、H ≤ 70、W(i) ≤ 100<br />
<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
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